Development of a Distributed Hydrological Model Using Multi-step, Multi-reach Muskingum-Cunge Method.

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  • Ｍｕｌｔｉ‐ｓｔｅｐ，Ｍｕｌｔｉ‐ｒｅａｃｈ　Ｍｕｓｋｉｎｇｕｍ‐Ｃｕｎｇｅ法を用いた分布型水文モデルの開発
  • Multi-step Multi-reach Muskingum-Cungeホウ オ モチイタ ブンプガタ スイモン モデル ノ カイハツ

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Abstract

The objective of this study is to develop a distributed hydrological model applicable to continental scale catchments to take into account the runoff concentration over the catchment and the hydrograph attenuation within the channel network. In this study, channel networks showing the flow direction of runoff are derived from geographic information at 1-degree resolution. A routing model using multi-step multi-reach Muskingum-Cunge method is newly developed in which all channels within a channel network are arranged into an optimal routing order to keep the routing be carried out from upstream to downstream. The runoff from each 1×1 degree grid cell is calculated by using Xin An Jiang rainfall runoff model and routed to the study points along the main channel. This model is applied to the Chang Jiang River basin and the Mississippi River basin for the period from January 1987 to December 1988. The simulated hydrographs at four hydrological stations along the above two rivers are compared with those derived by using kinematic wave method and the observed ones.

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